Re: [Flightgear-devel] If everybody had an ocean...

[David M. <da...@me...>]

Karl-Heinz Zimmer writes:
 > On Tuesday 28 August 2001 11:32 pm, Norman Vine wrote:
 > > David Megginson writes:
 > ..
 > > > Since roads are much longer than runways, they'll have to be segmented
 > > > fairly frequently, especially for US scenery using the DEM-3 data.
 > > > Even a 1km segment of straight road might go up and down a couple of
 > > > hills, and some segments can be 10 or 20km or more.  Knowing something
 > > > about the underlying DEM might help
 > 
 > > I guess I am assuming that we already have the dem triangulated
 > > then the 'interesting points' < places we want nodes in the road >
 > > are the intersections of the road polygon and the edges of the
 > > triangulation.  We already do something similar for rivers
 >                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 > 
 > So does that mean there *is* special code for rivers in FlightGear?

River and lake polys are flattened -- TerraGear goes through them and
normalizes the elevation nodes to an average.  Ocean polys have 0
elevation assigned throughout.

 > I thought I was going to implement them on a 'just paint them in the
 > scenery' basis by following the detailed advice I got in the
 > yesterday postings...

Yes, that's what you need to do.  Norm's simply referring to how
elevations are calculated internally by TerraGear.


All the best,


David

-- 
David Megginson
da...@me...